A fixed mass of gas emits \(250 \mathrm{~J}\) of heat energy and contracts at a constant pressure of \(1 \times 10^{5} \mathrm{~Pa}\) from \(2.5 \times 10^{-3} \mathrm{~m}^{3}\) to \(1.0 \times 10^{-3} \mathrm{~m}^{3}\). What is the change in the internal energy?

(a) \(-250 \mathrm{~J}\)

(b) \(100 \mathrm{~J}\)

(c) \(-100 \mathrm{~J}\)

(d) \(250 \mathrm{~J}\).